I have a personally signed copy of Peter Compton's book. It is much oil stained as I have used it many times while pondering an engine problem. Peter is alive and well, living in the BVI, if you want his contact details then pm me.

I already have Peter Compton's book and it is great. Clear pictures of how a worn but still acceptable impeller looks like and how it looks like when it needs changing. So helpful when you're doing it first time and need to decide for yourself. The book is clearly written with people who don't yet have the feel with engines in mind.

I've heard lots of good things about Calder's also and so I was going to buy it. But then I noticed two different covers and I'm a little bit puzzled now.

I suppose the content (text) should be the same. Still, one may be more nicely printed. The first book is 256 pages long and the second is 312. Reason for difference of 60 pages? Bigger font, more photos, better pictures, wider margins?